c++实现多线程ping代码

以下是用C++实现多线程Ping的示例代码：

#include <iostream>
#include <thread>
#include <vector>
#include <chrono>
#include <mutex>
#include <condition_variable>
#include <atomic>
#include <string>

#ifdef _WIN32
    #include <winsock2.h>
    #pragma comment(lib, "ws2_32.lib")
#else
    #include <netinet/in.h>
    #include <sys/socket.h>
    #include <arpa/inet.h>
#endif

std::mutex mtx;
std::condition_variable cv;
std::atomic<int> activeThreads(0);

void pingHost(const std::string& ip) {
    // 创建套接字
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == -1) {
        std::lock_guard<std::mutex> lock(mtx);
        std::cout << "Failed to create socket for " << ip << std::endl;
        return;
    }

    // 设置超时时间为1秒
    struct timeval timeout;
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;
    setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));

    // 设置服务器地址和端口
    struct sockaddr_in server;
    server.sin_family = AF_INET;
    server.sin_port = htons(80);
    if (inet_pton(AF_INET, ip.c_str(), &(server.sin_addr)) <= 0) {
        std::lock_guard<std::mutex> lock(mtx);
        std::cout << "Invalid address: " << ip << std::endl;
        return;
    }

    // 连接到服务器
    if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
        std::lock_guard<std::mutex> lock(mtx);
        std::cout << "Failed to connect to " << ip << std::endl;
        return;
    }

    std::lock_guard<std::mutex> lock(mtx);
    std::cout << "Ping successful to " << ip << std::endl;

#ifdef _WIN32
    closesocket(sock);
#else
    close(sock);
#endif
}

int main() {
#ifdef _WIN32
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "Failed to initialize Winsock" << std::endl;
        return 1;
    }
#endif

    std::vector<std::string> hosts = { "127.0.0.1", "192.168.0.1", "8.8.8.8" };

    std::vector<std::thread> threads;
    for (const auto& host : hosts) {
        threads.emplace_back([&]() {
            pingHost(host);
            activeThreads--;
            cv.notify_one();
        });
        activeThreads++;
    }

    std::unique_lock<std::mutex> lock(mtx);
    cv.wait(lock, [&]() { return activeThreads == 0; });

#ifdef _WIN32
    WSACleanup();
#endif

    return 0;
}

上述代码使用了C++的线程库std::thread来创建多个线程，每个线程执行pingHost函数来执行Ping操作。通过互斥锁std::mutex和条件变量std::condition_variable来实现线程同步和等待所有线程完成的功能。

注意：上述代码在Windows平台下使用了Winsock库进行套接字操作，而在其他平台下使用了标准的POSIX套接字操作。请根据实际平台进行适配或修改。